Resumen:

We investigate the ratchet dynamics of nonlinear Klein-Gordon kinks in a periodic, asymmetric lattice of
pointlike inhomogeneities. We explain the underlying rectification mechanism within a collective coordinate
framework, which shows that such a system behavWe investigate the ratchet dynamics of nonlinear Klein-Gordon kinks in a periodic, asymmetric lattice of
pointlike inhomogeneities. We explain the underlying rectification mechanism within a collective coordinate
framework, which shows that such a system behaves as a rocking ratchet for point particles. Careful attention
is given to the kink width dynamics and its role in the transport. We also analyze the robustness of our kink
rocking ratchet in the presence of noise. We show that the noise activates unidirectional motion in a parameter
range where such motion is not observed in the noiseless case. This is subsequently corroborated by the
collective variable theory. An explanation for this phenomenon is given.[+][-]